Electrochemistry and ion concentration, Chemistry

Assignment Help:

ELECTROCHEMISTRY AND ION CONCENTRATION

Activity dependence of cell voltage:

Measurement of galvanic cell potentials away from the standard state provides a convenient method for measuring ion activity and activity coefficient. As ion concentration is varied in a half-cell to vary ion activity. Equilibrium position of the half cell reduction reaction changes and that causes a change in the half-cell potential. The relationship between the activity and half-cell potential is given by the Nernst equation:

890_electrochemistry.png

for the general half-cell reduction reaction:

 aA+bB+ne-→cC+dD

Cells at equilibrium:

When a cell is at equilibrium, Ecell=0 (the 'flat battery' condition) and Q=K, the equilibrium constant for the reaction (see Topic C1). This gives the expression: which allows calculation of equilibrium constants (see Topic C1) for cell reactions from calculated or measured values.

 

199_electrochemistry1.png

which allows calculation of equilibrium constants for cell reactions from calculated or measured 1046_electrochemistry2.png values.


Related Discussions:- Electrochemistry and ion concentration

Qualitative Analysis of Cations, We are asked to design a qualitative analy...

We are asked to design a qualitative analysis scheme that can be used to determine which cations are present in a solution containing only four of the following cations: Pb2+, Ag+,

Awart sarni, plese give me awart sarni upto 200 nos

plese give me awart sarni upto 200 nos

P block, diamond is covalent.yet it has high melting point.why?

diamond is covalent.yet it has high melting point.why?

Find the number of degrees of freedom - single phase system, Find the numbe...

Find the number of degrees of freedom? Consider a single-phase system that is a gaseous mixture of N 2 , H 2 , and NH 3 . For each of the following cases, find the number of de

State about the point imperfection, State about the Point imperfection ...

State about the Point imperfection They are imperfect point-like regions in the crystal. One or two atomic diameters is the typical size of a point imperfection.  A substitu

What is a mixture experiment, Q. What is a mixture experiment? Mixture ...

Q. What is a mixture experiment? Mixture experiment is an experiment in which food quality indices are assured to depend on the relative proportion of ingredients.

Find the concentration of hydrogen ions, An aqueous solution has a hydroxyl...

An aqueous solution has a hydroxyl concentration of 1.75 x 10^-7mol/L. Find the concentration of hydrogen ions in this solution.

Describe the mechanism of ferromagnetism, Describe the mechanism of ferroma...

Describe the mechanism of ferromagnetism Ferromagnetism is the basic mechanism by which certain materials (like iron) form permanent magnets or/and exhibit strong interactions

IONISATION, #IONISATION ENERGY OF ELEMENTS..

#IONISATION ENERGY OF ELEMENTS..

Explain an lewis acid-base, An Lewis acid-base dissociation of the bromide-...

An Lewis acid-base dissociation of the bromide-essentially an SN1 reaction-gives an a-hydroxy carbo-cation, which is, by resonance, also the conjugate acid of acetophenone. Deproto

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd